Fix a small warning.

diff --git a/src/supported.c b/src/supported.c
index 417d4abf631064f59a0a99c449b5a97cba4e4b3c..abeb60cf38784db4736594728ee79701470ddf3c 100644 (file)
--- a/src/supported.c
+++ b/src/supported.c
@@ -115,7 +115,7 @@ change_isupport(const char *name, const char *(*func)(const void *), const void
 {
        rb_dlink_node *ptr;
        struct isupportitem *item;
-       const void *oldvalue;
+       const void *oldvalue = NULL;
 
        RB_DLINK_FOREACH(ptr, isupportlist.head)
        {